Photography Exposure Basics

It’s always good to take a moment to go over the basics of how a camera functions and the options you have available. Many people are snapping pictures using cameras that are set to auto. Modern digital cameras can do an excellent job in point-and-shoot mode. However, there is an entire world of artistic possibilities for those who invest the time to study the capabilities.

There’s even a formula that summarizes the entire procedure H=Et. The H value is the luminous exposure, E is the luminance of the image plane, as well as t is the exposure duration in seconds. Perhaps a more precise explanation would be useful.

Exposure, Aperture ISO

Imagine these three components like three legs of the stool. If all three elements are working together, you’ve got solid support. If one is just a bit off, it can throw the whole stool completely out of balance. By balancing the three parts using different methods, it is possible to achieve mixed results in your photos.


The term, formerly ASA, is a reference to the sensitivity to light of the media used for recording. Suppose it’s a film or Digital Imaging chip, the primary consideration for the quality of the image. Whatever the recording medium, the lower the amount of light an image capture device requires to produce, the more artifacts will appear in the final image.

Modern digital cameras have this loss of image quality from the camera’s onboard computer trying to correct and fill in the image in case it is not optimal lighting. In order to compensate for the low light, the camera boosts the sensitivity of its imaging chip, which results in a variety of visual artifacts called “noise.”

The greater the light, the more light, and the lower ISO the camera will choose. The camera’s computer has been specifically designed to pick the ISO that produces the best image quality with the light available. In the range of 20 percent less than full daylight, the camera’s image processor will be working at the highest effectiveness. In order to get the correct amount of illumination, your camera may choose a higher ISO or activate the onboard flash.

Aperture or F-stop

The second control of exposure for lighting your photos is the aperture. The aperture is situated on top of your imaging surface. It works in the opposite direction to ISO. The lower the number called an f stop, the more light can pass from the lens.

If you hear photographers talking about”fast” lenses, they are talking about “fast” lenses; it is lenses that have the capability of adjusting extremely low F-stops.

What is the effect of depth of field of focus (DoF)? When you use lower f-stops, your camera will have a smaller DoF. When you use higher f-stops, your camera is equipped with a wide DoF. If you’d like to keep the background in focus, consider higher F-stops (which are less open) and if you wish to get the background away from the focus, think lower F-stops (wider apertures).

Shutter Speed

The shutters on modern SLRs actually function than plates, leaving the image surface exposed for a short time, and are sometimes referred to as “curtains.” The first surface to move away from the camera is often referred to as”the “first curtain,” and the following “second curtain” blocks light to the chip.

This is why the majority of flashes have a specific sync speed. With very high shutter speeds, there isn’t sufficient time in between curtains 1 and 2 so that the flash can begin firing in the absence of one curtain getting blocking the other. This is also the reason why certain flash units come with a label that says 1st or 2nd sync. It is possible to set the flash in sync when you open the shutter or right prior to closing.

This feature on your camera lets you select your shutter speed. More efficient to freeze objects that move rapidly and slower to create motion blur.

Explore the various ways your camera can offer. You’ll discover the variety of possibilities fascinating.